Hanger plug



FIG. 1 is a perspective view of a hanger plug showing the new design;

FIG. 2 is a side view thereof; and,

FIG. 3 is a top view thereof.

The broken line portions of the disclosure are for illustrative purposes only and form no part of the claimed design. The bottom of the hanger plug is generally hidden from view and, therefore, not shown. 

The ornamental design for a hanger plug, as shown and described. 